Adding-pencil



(No Model.)

W. W'. BROWN.

ADDING PENGL.

No. 592,723. Pateutedct. 26,1897.

TaLrmQ, WASHINGTON n c the ratchet-spring.

struction.

UNTTEDV STaTns PATBNT Ormes.

VILLIAM WV. BROVN, OF MACON, GEORGIA.

ADDiNG- PENCIL..

SPECIFICATION forming part of Letters Patent No. 592,723, dated October 26, 1897'. Application filed January 16, 1897. Serial No. 619,480t. (No model.)

To all who-m, t may concern:

\ Be it known that I, VILLIAM WV. BROWN, of the city of Macon, county of Bibb, and State of Georgia, have invented a new and Improved Addition-Pencil, of which the following is a full and exact description.

My invention relates to a pencil for use in adding columns of figures, whereby the work of addition is facilitated by the pencil registering the number of tens added, leaving to, be added or carried in the mind only the number of units less than any ten not registered.

In the accompanying drawings, Figure l is a longitudinal central section of my pencil device, eXcept thattube carrying leads is shown in elevation. Fig. 2 is a plan taken at right angles to plane of Fig. l, the half of pencilcase being removed to show internal con- Fig. 3 is an elevation of pencil. Figs. 4 and -5 are plan. and side views of parts shown in Figs. l and 2 removed from case.

A is the pencil-case.

B is a register or indicator plate sliding within the case provided on its face, which slides against case with a series of numbers placed one below another, beginning at the end b, and provided with a similar number of ratchet-teeth on its back indented into its central longitudinal portion.

D is a tube sliding within the pencil-case in the guide-blocks O and O', and carrying upon its upper end the ratchetspring 7i, which engages with the ratchet-teeth in the register-plate above mentioned.

g is a spring-dog attached to the guideblock O, bi1 urcated at its end, so as to bring its ends g into frictional Contact with the smooth marginal edges of the register-plate and hold it in whatever position it may be left by This construction thus makes necessary less adjustment of position between the ratchet and dog springs.

The tubeD is provided with marking-leads in the usual manner and with a spiral spring which projects it from the case whenever the pressure which slides it into the case is removed.

e is the spring bearing against the collar f and the guideblock O.

C is a guide-block holding the pencil-tube D central tothe case provided with guideways on its two sides to carryY the unlocking slide or tongue kgsuch guideways being also so formed as to lift the slide when it is pushed upward or toward the spring-ratchet and spring-dog described, and also to cause it to retract itself when released.

C' is the lower guide-block inserted into the pencil-case to guide lower end of pencil tube and slide.

7c is a slide moving in ways made in O and O', provided with a push or lug button Z, eX- tending through the case in a slot, as shown, and at its upper end having two nibs O O and a cross-bar 7e', the two nibs extending under the curve of the bifurcated end of the dog-spring g, and when in its normal position not quite in @Contact The cross-bar k extends under the curve part of the ratchetspring 7L in the same relative position as the nibsA to the dog-spring. The part of slide lying in the guideway of the block O is made with an inclined bearing part, so that when it is pushed toward the dog-spring its wedge or inclined portion. passing over or against the raised part O2 of guideway will be lifted, raising up the cross-bar and nibs under the curved parts of the springs, and thus facilitating the lifting of the springs from contact with the register-plate.

The slide 7c, being thin, is made of such curvature as to touch the ease near the pushlug, and its end being supported in way cut in guide-block O gives its wedge or inclined part pressure which causes it to slide on guideblock C, thereby quickly removing itself from contact with the ratchet and dog springs when the push-button is released.

The inclined bearing edge or wedge-shaped bearing part is so proportioned to the length of the nibs and position of the cross-bar that they will come into contact with the springs before the wedge parts become operative, when they begin their lifting movement as the forward movement is continued, and the springs are at once lifted clear of the register-plate. K

i is a sight-hole in the case through which each number on the plate may be seen as it comes opposite.

The operation of the device may be described as follows: The operator taking the pencil and beginning to add his column of IOO ligures will when the sum added reaches ten push down upon the pencil-case, the pencil resting on the paper. This will cause the sliding part (the pencil-tube) to move upward in the case, compressing the spiral spring e and pushing upward the register-plate by reason of the engagement of the ratchet-spring with the ratchet-teeth on the back of the plate. This movement, assuming the plate to stand at O, will bring the iigure l opposite the sight-hole, thus indicating that one ten has been passed in the addition. The operator then releasing` his pressure to continue his addition the spiral spring will project the sliding tube and the register-plate will be held in its advanced position by the pressure of the dog-spring on it. The operator now dismissing from his mind the ten recorded considers only whatever units above ten he may have had at the time of registering, and adding them to the next iignre proceeds to make anew record. Vhen he reaches ten again, he makes the pencil register by pressure. Thus always the pencil records the number of tens passed, and whatever units he may have after last register is made for column will be the iigure to be set below the column, when by a glance at the registerplate through the sight-hole he will see how many tens are to bc carried to the next column. rlhen by pushing upward on the lug or button the slide will lift the spring-ratchet and spring-dog clear of the register-plate and the plate will drop to O, and the addition of a new column can then be begun.

The indicator-plate may be so proportioned if desired, as to extend upward through the top of pencil-case and there show the numbers instead of showing them through a sight hole.

lV hat l claim as new and of my invention 1s l. The combination of a pencil-ease with a sliding part carrying a ratchet-spring, a dogspring and ratchet register-plate with a lon` gitudinal sliding tongue which releases thc register-plate by raising the contact of said. springs with said plate when the slide is moved substantially as described.

2. The combination of the sliding penciltube ratchet and dog-spring with a slide provided with an inclined bearing edge whereby it is made to lift the springs when given a longitudinal movement substantially as de scribed.

lVlLLlAM XV. BROVN.

lVitnesses:

O. L. Sloan, Jas. A. THOMAS, Jr. 

